Qt Documentation

Blend QML Type

Merges two source items by using a blend mode. More...

Import Statement:	import QtGraphicalEffects 1.14
Since:	QtGraphicalEffects 1.0
Inherits:	Item

List of all members, including inherited members

Properties

cached : bool
foregroundSource : variant
mode : string
source : variant

Detailed Description

Blend mode can be selected with the mode property.

source	foregroundSource	Effect applied

Note: This effect is available when running with OpenGL.

Example

The following example shows how to apply the effect.

import QtQuick 2.12
import QtGraphicalEffects 1.12

Item {
    width: 300
    height: 300

    Image {
        id: bug
        source: "images/bug.jpg"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }

    Image {
        id: butterfly
        source: "images/butterfly.png"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }

    Blend {
        anchors.fill: bug
        source: bug
        foregroundSource: butterfly
        mode: "subtract"
    }
}

Property Documentation

cached : bool

This property allows the effect output pixels to be cached in order to improve the rendering performance.

Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.

It is recommended to disable the cache when the source or the effect properties are animated.

By default, the property is set to false.

foregroundSource : variant

This property defines the item that is going to be blended over the source.

Note: It is not supported to let the effect include itself, for instance by setting foregroundSource to the effect's parent.

mode : string

This property defines the mode which is used when foregroundSource is blended over source. Values are case insensitive.

mode	description
normal	The pixel component values from foregroundSource are written over source by using alpha blending.
addition	The pixel component values from source and foregroundSource are added together and written.
average	The pixel component values from source and foregroundSource are averaged and written.
color	The lightness value from source is combined with hue and saturation from foregroundSource and written.
colorBurn	The darker pixels from source are darkened more, if both source and foregroundSource pixels are light the result is light.
colorDodge	The lighter pixels from source are lightened more, if both source and foregroundSource pixels are dark the result is dark.
darken	The darker pixel component value from source and foregroundSource is written.
darkerColor	The lower luminance pixel rgb-value from source and foregroundSource is written.
difference	The absolute pixel component value difference between source and foregroundSource is written.
divide	The pixel component values from source is divided by the value from foregroundSource and written.
exclusion	The pixel component value difference with reduced contrast between source and foregroundSource is written.
hardLight	The pixel component values from source are lightened or darkened according to foregroundSource values and written.
hue	The hue value from foregroundSource is combined with saturation and lightness from source and written.
lighten	The lightest pixel component value from source and foregroundSource is written.
lighterColor	The higher luminance pixel rgb-value from source and foregroundSource is written.
lightness	The lightness value from foregroundSource is combined with hue and saturation from source and written.
multiply	The pixel component values from source and foregroundSource are multiplied together and written.
negation	The inverted absolute pixel component value difference between source and foregroundSource is written.
saturation	The saturation value from foregroundSource is combined with hue and lightness from source and written.
screen	The pixel values from source and foregroundSource are negated, then multiplied, negated again, and written.
subtract	Pixel value from foregroundSource is subracted from source and written.
softLight	The pixel component values from source are lightened or darkened slightly according to foregroundSource values and written.

Example source	Example foregroundSource

Output examples with different mode values

mode: normal	mode: addition	mode: average

mode: color	mode: colorBurn	mode: colorDodge

mode: darken	mode: darkerColor	mode: difference

mode: divide	mode: exclusion	mode: hardlight

mode: hue	mode: lighten	mode: lighterColor

mode: lightness	mode: negation	mode: multiply

mode: saturation	mode: screen	mode: subtract

mode: softLight

source : variant

This property defines the source item that is going to be the base when foregroundSource is blended over it.

Note: It is not supported to let the effect include itself, for instance by setting source to the effect's parent.

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